Attempt #1:
Feed on Fear (Su): A thunder child can feed on other creatures fear. Anyone within x feet that observes a thunder child's frightening actions (such as banging doors, tossing objects, and so forth) must succeed on a DC X Will save or take 1 point of Wisdom damage. Additionally, any creature that fails its save must succeed on a second DC X Will save or be shaken for 1 minute. A victim reduced to Wisdom 0 dies of fright. On each such successful attack, the thunder child gains 5 temporary hit points. The save DCs are Charisma-based. The save must be repeated for each minute of exposure. This is a mind-affecting fear effect.